Simultaneous measurement of neural activities of acute mouse hippocampal slices
using multi-electrode array system and laser confocal calcium imaging
Yuuta Hamasaki ¹, Natsumi Haba ², Naoki Iwata ², Yoshiki Uno ², Minoru Saito <sup>1,2,*

1</sup> Department of Biosciences, College of Humanities and Sciences, Nihon University, Tokyo 156-8550, Japan
² Department of Correlative Study in Physics and Chemistry, Graduate School of Integrated Basic Sciences, Nihon University, Tokyo 156-8550, Japan
These authors contributed equally to this work.
^*Corresponding author: Minoru Saito, Department of Correlative Study in Physics and Chemistry, Graduate School of Integrated Basic Sciences, Nihon University,
  3-25-40 Sakurajosui, Setagaya-ku, Tokyo 156-8550, Japan.


Abstract

Recently, non-invasive, real-time and multi-point measurement of neural activities has become possible by using a multi-electrode array (MEA). Another method for multi-point measurement is the fluorescent imaging technique using voltage indicator dyes or calcium indicator dyes. Especially, calcium imaging using fluorescent calcium indicator dyes is often more useful, because they exhibit larger changes in the fluorescence intensity than voltage indicator dyes and their fluorescence changes can be detect easily. Additionally, calcium signals play key roles in the brain function, such as the long-term potentiation (LTP) in the hippocampus, and calcium imaging can be a powerful tool to elucidate the brain function. In this study, we constructed a measurement apparatus combining the MEA system and laser confocal calcium imaging and simultaneously measured electric signals and calcium signals in acute mouse hippocampal slices. The obtained results showed the availability of the present method.

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